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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Equipment $ 16,223 $ 15,465
Equipment in progress 4,328 2,895
Leasehold improvements 3,458 3,359
Furniture and fixtures 3,405 2,817
Office equipment 958 799
Equipment under capital lease 626 159
Total property and equipment 28,998 25,494
Accumulated depreciation and amortization (4,513) (2,980)
Property and equipment, net $ 24,485 $ 22,514